Blast-regulator for fans



(No Model.)

A. KAHL.

BLAST REGULATOR FOR FANS.

N0. 329,567. 1 Patented Nov. 3, 1885.

Mentor:

N, PETERS. Phawljthographu, Wuhinglnn. D. C.

UNITED STATES PATENT OFFICE.

ADOLPII KAIIL, OF SORENIO, ILLINOIS.

BLAST-REGULATOR FOR FANS.

SPECIFICATION forming part of Letters Patent No. 329,567, dated November 3, 1885.

Application filed November 17,1884. Serial No. 148,140. (No model.)

To all whom it may concern.-

Be it known that I, ADOLPH KAIIL, of Sorento, Bond county, Illinois, have invented a certain new and useful Improvement in Blast- Regulators for Fans, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

This improvement relates to mechanism for regulating the force of the blast of fans.

Figure 1 is a side view of a fan with my improved regulator attached. Fig. 2 is a sec tion at 2 2, Fig. 1, with some parts shown in elevation and some parts broken out.

A is the fan-casing, into which the air enters through registers at the center, the registers having segmental openings B for the passage of air, and segmental valves 0 upon hubs G, capable of being turned for the purpose of regulating the size of the air-openings B. The construction so far is common in blastregulators, and needs no further description. The air is discharged from the case through mouth D.

E is the fan-shaft, having arms F, carrying fans or wings G.

H is a beltpulley by which the shaft is rotated.

I I are arms extending in opposite direc tions from the shaft, and carrying the balllevers of the governor. The ball-levers have bell-crank form, each having an arm, .1, carrying at its end the ball K, and an arm, L, connected bya link, M, to a cross-piece, N, working in a longitudinal diametric slot through the shaft, such slot being shown at O.

P is a push-rod working in an axial socket in the shaft, said socket extending from the slot at 0 through the end of the shaft. The outer end of the push-rod bears against one arm of a bell-crank lever, Q, fulcrumed to a bracket-arm, Q, the other end of said lever being connected by a rod, R, to a lever, S, fulcrumed atT to the case, and having its free end connected by a rod, U, to a pin, V, upon the valves 0. The arrangement of parts is such that as the balls K are thrown outward by centrifugal force the cross -piece N is pressed against the push-rod, the bell-crank 0 is forced outward and upward, the lever S is raised, and the air-openings B are partly closed by the valves 0. This movement of the parts is indicated by dotted lines. The outward movement of the governor-balls is opposed by a spring, IV, secured to the bracket-arm Q,and bearing upon the bell-crank Q, and a weight, X, which is movable on the lever S, so as to give means for regulating the resistance to the outward movement of the governor-balls. WVhere the air enters at both ends, as shown in this blower, and which is the preferred construction, there is a similar register upon each end, worked by a similar lever, S, and rod U; but the mechanism by which the governor acts upon the lever S is not duplicated, as both levers S are rigidly attached to the same rock-shaft,T, so that the two levers move synchronously. It is evident that an increase of speed in the shaft E will partly close the air-openings B, and thus counteract the increased blast of the rotary fan arising from the'increased speed, and thus a regular blast may be maintained at all speeds.

This blower or fan-regulator is applicable in all cases where a regular blast is required. It may be so constructed as to give a lighter blast at a high speed than at a slower speed, if desired. To illustrate, by the application of the device to a grain separator the blast should be less when the speed is high,to avoid the blowing over of grain.

I claim.

1. In a blast-regulator for fans, the combination, with the fan-shaft having a diametric slot therethrough and an axial bore or socket extending from said slot to the end of said shaft, of a push-rod occupying said socket, a cross-head passed through and working in said slot in contact with said push-rod, the bellcrank governor-arms, each having a ball at one extremity and connected at the other with said cross-head, and the register acted upon by said push-rod, substantially as set forth.

2. In a blast-regulator for fans, the combination,with the main shaft having a diametric slot therethrough and an axial bore or socket extending from said slot to the extremity of said shaft, a push-rod occupying said bore or socket, and the weighted bell-crank governorarms connected with said rod, of a bell-crank lever outside of the case, against one arm of which the push-rod engages, a lever havinga weight, the register,and connectionsbetween the weighted lever and the bellcrank lever and register, substantially as set forth.

3. In a blast-regulator for fans, the combition, with the main shaft having a diametric slot thercthrough, and an axial bore orsocket' extending from said slot to the end of the shaft, of a push-rod occupying said socket, a cross-head passed through and working in said slot in contact with said push-rod, the bellcrank governor-arms, each having a weight secured to one end, a link connecting the other extremity of each of said bell-crank governorarms witlrsaid cross-head, a bell-crank lever pivoted on the outside of the casing, a lever having a weight secured thereto, connection between said weighted lever and the bell-- crank lever, the register, and connection between said regulator and weighted lever, sulo- 2o stantially as set forth.

- ADOLPH KAHL.

Witnesses:

'SAML; KNIGHT, GEO. H. KNIGHT. 

